Lifting-jack



- (No Modl.)

J. P. HAYS.

LIPTING JAGK i 10.406,523. Patented July 9, 1889.

M .4 /f v v N. PETERS, Pholvlilhognphcr. Wallington. ILC.

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UNITED STATES y.

PATENT OFFICE.

JAMES I). I'IAYS, OF NORTH TEMESCAL, CALIFORNIA.

` LIFTINe-JAGK.

SPECIFICATION forming part of Letters Patent No. 406,523, dated JulylQ,1889. l Application filed January 16, 1889i lSerial No. 296,547. (Nomodel.)

.To all whom. it may concern/.- v

Be it known that I,'.IAMES P. HAYS, of North Temescal, in the county ofAlameda and State of California, have invented an Improvement inLifting- Jacks; and I hereby declare the following to be a full, clear,and exact der" scription thereof. y

My invention relates to the class of liftingjacks; and my inventionconsists in the novel A construction, combination, and arrangement ofstandard, lift, lever, clutch, and arm, which I shall hereinafter fullydescribe.

The object of my invention is to'provide a simple andreadily-adjustableliftingjack. i

Referring to the accompanying drawing, the iigure is a view of myliftingvjack.

A is the standard. B is the lift, having an eye or socket hitted overthe standard, adapting it to be movedV The lift has a downwardly-er;``

vertically. tended arm b', having a socket oreye b2 on its end, fittedupon the standard below, and

serving as a guide to render the vertical move` i or guide socket b2 ofthelift B.

D are links pivoted to the upturned ends c of the lever and to the liftB.

E is the clutch. This consists of a ring tted freely upon the standard.It has a stem e, which is pivoted at e between the forked upturned endsof the lever C.

The operation of these parts is as follows: When in a state of rest, theparts are all held up at any position on the standard to which they mayhave been adj usted by the clutchring E, which, under the weight of saidparts, turns on its pivot c', so as to cramp upon the standard bygetting out of a horizontal plane. The clutch thus fixed serves as afixed fulcrum, about which the lever C may now be moved, in order tobring its upturned ends and the links D into alignment, which therebyelevates the lift up to the weight to be raised, and continued movementunder the same conditions raises the weight upon the lift until i thelever ends and links, passingthe vertical,

are stopped by a cross-pin c in the fork ofthe lever coming in contactwith the standard,

and the part-s are held in this position, the 'clutch-ring stillengaging the standard and 'serving as a support for the lift and weight.Y i In order tovallow the parts to be readily moved down on the standardto primarily adjust them, I provide the stem e. of the clutchring..` Ewith an upwardly-extending arm F. By pressing upon this arm, so astobring it parallel with the standard, the clutch-ring E is brought to ahorizontal, and thus ceases to bind or cramp upon the standard, so thatall the parts may be allowed to descend. TheV arm F also serves thefurther purpose of a limiting-stop for thel clutch-ring when by i meansof the lever C all the `parts are bodily run up on the standard toadjust themprif marily in the neighborhood of the welght to be raisedVIt serves thispurpose by coming in contact With the standard, andthereby preventing the clutch-ring from cramping in the wrong direction,which it has a tendency to do when lifted by the lever C.

I may, if desired for greater security, pro-V vide the stem e of theclutch-ring E with a fixed pawl G, which is adapted to engage notches orteeth g, formed on the standard when the clutch cramps under the Weightof the load, as heretofore described; but when the arm F is pressedinwardly the pawl G is thereby thrown out from its engagement.

Having thus described my invention, whatI claim as new, and desire tosecure by Letters Patent, isn l. In a lifting-jack, the combination of astandard, a lift vertically movable thereon, a lever connected with thelift, and a clutch connected with the lever and engaging the standard,said clutch forming the fulcruln for the lever and support for the lift,substantially as described.

2. In a lifting-jack, the combination of a standard, a lift verticallymovable thereon, a lever connected with the lift, and a clutch tted toand vertically movable upon the standard, said clutch being connectedwith the lever and forming, when engaging the standard, the fulcrum forthe lever and support for the lift, substantially as described.

IOO

3. In a lifting-jack, the combination of a standard, a lift verticallymovable thereon, a lever connected with the lift, and a clutchringplvoted to the lever and fitting over the standard, whereby it isadapted to cramp thereon and form afulcrnm for the lever and support forthe lift, substantially as described.

4. In a lifting-jack, the -combination of a standard, a lift verticallymovable thereon, a lever having an npturned inner end, a link connectingsaid end With the lift, and a clutchrlng pivoted to the uptnrned end ofthe lever and fitting over the standard, whereby it is adapted to crampthereon and form a fnlcrnm for the lever and support for the lift,substantially as described.

5. In a lifting-jack, the combination of the standard, the lift havingan eye or socket tted on the standard, and an extension with guide eyeor socket tted on thelstandard be` low, whereby said lift is adapted tomove vertically on the standard and is guided in its movement, the leverhaving forked npturned ends passing 011 each side of the standard, thelinks'conneeting said ends with the lift, and the clutch-ring pivoted inthe upturned ends of the lever and fitting over the standard, whereby itis adapted to cramp thereon and form a fulcrnin for the lever andsupport for the lift, substantially as described.

6. In a lifting-jack, the combination of a standard, a liftvverticallymovable thereon, a lever connected with the lift, a clutch-ringpivot-'ed to the lever and fitting over the standard, whereby it isadapted to cramp thereon and form a fulcrum for the lever and supportfor the lift, and the arm fixed to the clutchring` for relieving it fromthe standard, substantially as described.

7. In a lifting-jack, the standard having the notches or teeth, the lifttted to and vertically movable on the standard, the lever connected withthe lift, the clutchrring pivoted to the lever and iitting over an dengaging the standard, as described, and the liXed pawl on theclutch-ring for engaging the notches or teeth of the standard,substantially as described.

8. In a lifting-jaclgthe standardhming the notches or teeth, the liftfitted to and vertically movable on the standard, the lever connectedwith the lift, the Yclntclrring pivoted to the lever and tting over andengaging the standard, as described, the pawl on the clutchring forengaging the notches or teeth of the standard, and the arm on theclutch-ring for relieving it, substantially as described.

9. A lifting-jack consistingof the combination of the notched standard,the sliding lift with guide-extensions fitted on said standard, theforked lever passing on each side of the standard, the links connectingsaid lever with IJthe lift, the clutch-ring pivoted to the lever andfitting over the standard, and the pawl and arm of said clutch-ring,substantially as described.

In Witness whereof I have hereunto set my hand.

JAMES P. HAYS.

\Vitnesses:

S. H. NoURsE, H. C. LEE.

